/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.compatibility.transport.file.comparator;

import org.mule.runtime.core.util.ClassUtils;
import org.mule.runtime.core.util.FileUtils;

import java.io.File;
import java.text.MessageFormat;
import java.util.Comparator;

/**
 * <p>
 * <code>OlderComparatorComparator</code> is a {@link Comparator} of File which is capable of comparing files for equality based
 * on their modification dates.
 * </p>
 */
public class OlderFirstComparator implements Comparator {

  @Override
  public int compare(Object o1, Object o2) {
    if (o1 instanceof File && o2 instanceof File) {
      File f = (File) o1;
      File f1 = (File) o2;
      boolean fileNewer = FileUtils.isFileNewer(f, f1);
      boolean fileOlder = FileUtils.isFileOlder(f, f1);
      if (!fileNewer && !fileOlder) {
        return 0;
      } else if (fileNewer) {
        return 1;
      } else {
        return -1;
      }

    }
    throw new IllegalArgumentException(MessageFormat.format("Expected java.io.File instance, but was {0} and {1}",
                                                            ClassUtils.getShortClassName(o1, "<null>"),
                                                            ClassUtils.getShortClassName(o2, "<null")));
  }
}
